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Letters Patent No. 73,828, dated January 28, 1868.

IMPROVEMENT IN TRY-SQUARES.

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To .A 'LL WHoM rr MAY co'NoEnNf Be it known that I, H. L. OGDEN,-of'Atkinson, in the county of Henry, and State of Illinois, have invented a new and improved Try-Square;.and I do hereby declare that the following is afnll, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

The present invention consists in so constructing a try-square as tozadjust itself to the edge of the material, and to adord a means of' indication, by a graduated scale, of ,the amount of accuracy in the workfand whether it be more or-less right-angular. In the accompanying plate of. drawings my improved try-square is illustrated Figure l being a side view of the sam, partially broken out at its joint, and

Figure 2 an edge View or elevation.

Similar letters of reference -indicate corresponding parts.

A, in the drawings, represents my improved try-square made in two parts or sections, B and C, pivoted together at D, with the one, B, arranged to swing or turn around within the slot E of the end to the part O, from a right angle to, or thereabouts, an angle-of forty-five degrees. F, a bent spring arranged on part B, to bear upon and act against the other part, C, for throwing and holding it back, the part B being limited in its movement by the length of the curve slot a'moving over stud or pin b. The face G of the part B is graduated or marked off suitably for indicating, by the index-manic()2 onl the edge of part C, the angle or inclination, whether more or less, at which the part B' is inclined when brought against the edge ofthe work.

I claim asAneW, and desire to secure by Letters Patent- A. try-square constructed as described, and consisting 6 the blade B, provided` with a. slot, a, and pivoted within a slot in the handle C, spring F, and stop-pin b, the square being provided with a. graduated scale, all arranged and operating as set forth. l

H. L. OGDEN.

Witnesses: v-

B. S. LEININGER, JOHN ASHLEY, Jr. 

